Technische Universität Braunschweig
  • Study & Teaching
    • Beginning your Studies
      • Prospective Students
      • Degree Programmes
      • Application
      • Fit4TU
      • Why Braunschweig?
    • During your Studies
      • Fresher's Hub
      • Term Dates
      • Courses
      • Practical Information
      • Beratungsnavi
      • Additional Qualifications
      • Financing and Costs
      • Special Circumstances
      • Health and Well-being
      • Campus life
    • At the End of your Studies
      • Discontinuation and Credentials Certification
      • After graduation
      • Alumni
    • For Teaching Staff
      • Strategy, Offers and Information
      • Learning Management System Stud.IP
    • Contact
      • Study Service Centre
      • Academic Advice Service
      • Student Office
      • Career Service
  • Research
    • Research Profile
      • Core Research Areas
      • Clusters of Excellence at TU Braunschweig
      • Research Projects
      • Research Centres
      • Professors‘ Research Profiles
    • Early Career Researchers
      • Support in the early stages of an academic career
      • PhD-Students
      • Postdocs
      • Junior research group leaders
      • Junior Professorship and Tenure-Track
      • Habilitation
      • Service Offers for Scientists
    • Research Data & Transparency
      • Transparency in Research
      • Research Data
      • Open Access Strategy
      • Digital Research Announcement
    • Research Funding
      • Research Funding Network
      • Research funding
    • Contact
      • Research Services
      • Academy for Graduates
  • International
    • International Students
      • Why Braunschweig?
      • Degree seeking students
      • Exchange Studies
      • TU Braunschweig Summer School
      • Refugees
      • International Student Support
      • International Career Service
    • Going Abroad
      • Studying abroad
      • Internships abroad
      • Teaching and research abroad
      • Working abroad
    • International Researchers
      • Welcome Support for International Researchers
      • Service for Host Institutes
    • Language and intercultural competence training
      • Learning German
      • Learning Foreign Languages
      • Intercultural Communication
    • International Profile
      • Internationalisation
      • International Cooperations
      • Strategic partnerships
      • International networks
    • International House
      • About us
      • Contact & Office Hours
      • News and Events
      • International Days
      • 5th Student Conference: Internationalisation of Higher Education
      • Newsletter, Podcast & Videos
      • Job Advertisements
  • TU Braunschweig
    • Our Profile
      • Aims & Values
      • Regulations and Guidelines
      • Alliances & Partners
      • The University Development Initiative 2030
      • Facts & Figures
      • Our History
    • Career
      • Working at TU Braunschweig
      • Vacancies
    • Economy & Business
      • Entrepreneurship
      • Friends & Supporters
    • General Public
      • Check-in for Students
      • CampusXperience
      • The Student House
      • Access to the University Library
    • Media Services
      • Communications and Press Service
      • Services for media
      • Film and photo permits
      • Advices for scientists
      • Topics and stories
    • Contact
      • General Contact
      • Getting here
  • Organisation
    • Presidency & Administration
      • Executive Board
      • Designated Offices
      • Administration
      • Committees
    • Faculties
      • Carl-Friedrich-Gauß-Fakultät
      • Faculty of Life Sciences
      • Faculty of Architecture, Civil Engineering and Environmental Sciences
      • Faculty of Mechanical Engineering
      • Faculty of Electrical Engineering, Information Technology, Physics
      • Faculty of Humanities and Education
    • Institutes
      • Institutes from A to Z
    • Facilities
      • University Library
      • Gauß-IT-Zentrum
      • Professional and Personnel Development
      • International House
      • The Project House of the TU Braunschweig
      • Transfer Service
      • University Sports Center
      • Facilities from A to Z
    • Equal Opportunity Office
      • Equal Opportunity Office
      • Family
      • Diversity for Students
  • Search
  • Quicklinks
    • People Search
    • Webmail
    • cloud.TU Braunschweig
    • Messenger
    • Cafeteria
    • Courses
    • Stud.IP
    • Library Catalogue
    • IT Services
    • Information Portal (employees)
    • Link Collection
    • DE
    • EN
    • Instagram
    • YouTube
    • LinkedIn
    • Mastodon
    • Bluesky
Menu
  • Research
  • Research Profile
  • Clusters of Excellence at TU Braunschweig
  • SE²A - Sustainable and Energy-Efficient Aviation
  • Research
  • ICA B "Flight Physics and Vehicle Systems"
Logo Sustainable and Energy Efficient Aviation of TU Braunschweig
B1.7 - Extension of Correlation-based Transition Transport Models for Laminar Aircraft Design
  • ICA B "Flight Physics and Vehicle Systems"
    • B5.2 - Application of physics-based finite-element tools in stiffness tailored structures for cryogenic hydrogen storage for improved mechanical and thermo-mechanical response
    • B4.2 - Consistent Multilevel Model Coupling and Knowledge Representation in Multidisciplinary Analysis and Design
    • B4.1- Collaborative Multidisciplinary Structural Design and Thermal Management for Electric Aircraft
    • B3.5 - Production technologies for hybrid suction designs - Bonding of micro-perforated sheets for hybrid laminar flow control suction panels
    • B3.2 - Advancing the additive xHLFC suction panel concept towards wind-tunnel readiness
    • B3.1 - Protective, multifunctional suction shells for hybrid laminar flow control: Design, integration, simulation and testing
    • B2.5 - EverScale - Enhancement and verification of load alleviation technologies by subscale flight testing
    • B2.4- Hybrid load alleviation by fluidic/reversed control and nonlinear structures
    • B2.3 - ARGO2 - Integrated design of control methods for stability of elastic aircraft
    • B1.9 - Validation of turbulent boundary layer-induced sound transmission through a fuselage section
    • B1.8 - Wind-tunnel experiments of advanced design of swept-wing with suction surfaces
    • B1.7 - Extension of Correlation-based Transition Transport Models for Laminar Aircraft Design
    • B1.6 - Effective Design Methods and Design Exploration for Laminar Wing and Fuselage
    • B1.5 - Sensitivities of Laminar Suction Boundary Layers for Large Reynolds Numbers
    • B1.3- Physics of broadband noise of sound sources from installed propulsors
    • JRG-B1 - Physics of Laminar Wing and Fuselage
    • JRG-B2 - Flow Physics of Load Reduction
    • B1.1 - Propeller and wing aerodynamics of distributed propulsion
    • B1.2 - Aerodynamic analysis of partly embedded boundary layer ingesting propulsors
    • B1.3 - Fast non empiric prediction of propulsion installation related noise
    • B1.4 - Transition Prediction and Design of Hybrid Laminar Flow Control on Blended Wing Bodies Based on 3D Parabolized Stability Equations
    • B2.1 - Load reduction potential of nonlinear stiffness and damping technologies
    • B2.2 - Structural technologies enabling load alleviation
    • B2.3 - Active load Reduction for enabling a 1-G wing using fOrward-looking and distributed sensors (ARGO)
    • B2.4 - Morphing structures for the 1g-wing
    • B3.1 - Global and Local Design Methodology for Laminar Flow Control
    • B3.2 - Process simulation and multiscale manufacturing of suction panels for laminar flow control
    • B3.3 - Thin Plies in Application for Next Generation Aircraft (TANGA)
    • B3.4 - New methods for failure and fatigue analysis of suction panels for laminar flow control
    • B5.1 - ADEMAO: Aircraft Design Engine based on Multidisciplinary Analysis and Optimization
    • JRG-B5 - Long-Range Aircraft Configurations and Technology Analyses
    • JRP - Permeation assessment for cryogenic applications by means of Fiber Bragg Grating sensors
    • ⯇ back to research

B1.7 - Extension of Correlation-based Transition Transport Models for Laminar Aircraft Design

The reduction of viscous drag on future aircraft configurations plays a key role in the transformation of aviation towards climate-neutrality. To achieve significantly reduced viscous drag, laminar flow over the aircraft needs to be maintained employing either Natural Laminar Flow (NLF) and/or Hybrid Laminar Flow Control (HLFC). Mitigation of high financial risk and an acceleration of the design process is achieved with an extensive and integrated usage of digital tools including high-fidelity numerical methods to permit a reliable evaluation especially at the early stages of the design. To this end, computational fluid dynamics (CFD) plays a key role for the aerodynamic prediction. For the design of laminar aircraft, comprehensive laminar-turbulent transition prediction methods are needed. On the one hand, the transition prediction methods need to be accurate, robust, efficient and reliable. On the other hand, they need to be automatable, user-friendly and deliver transition locations on the complete surface of three-dimensional geometries. Transition prediction methods based on local, linear stability analysis via the eN-method or based on the non-linear and non-parallel Parabolized Stability Equations (PSE) have proven to be accurate and reliable but they are not fully automatable, expert knowledge is needed for their application and results are only provided along (stream)lines. A comparatively new class of boundary-layer transition prediction methods compatible with modern, unstructured CFD codes are local correlation-based transition models. As these models rely on quantities locally available in a CFD code, they are well suited for automatization and, they deliver transition locations over three-dimensional surfaces, which makes them a promising candidate for design and optimization tasks. However, as they rely on empirical transition criteria, it is necessary to ensure and demonstrate the required level of accuracy, robustness and reliability for general 3D configurations, which is the objective for this project.

Figure 1: Comparison of original model (left) and helicity-based extension (right) to predict crossflow transition with experimental data for the sickle wing.

The inhouse CFD-solver, the DLR TAU-Code, consists of local correlation-based models to predict laminar-turbulent transition. This includes extensions to predict transition due to crossflow instabilities. The extension is two-fold: the first approach relies on infinite swept wing theory using the 2.5D Falkner-Skan and Cooke equations to derive the extension and is only valid to predict laminar-turbulent transition on wing-like geometries with flows close to the 2.5D assumption. A second approach is based on the helicity which provides a measure how helical the flow is which relates to the rotated crossflow component in the boundary-layer. The latter approach does not rely on infinite swept theory and can be used for arbitrary 3D geometries. A new empirical transition criterion was introduced to identify the critical value of the helicity indicating transition onset. It was calibrated based on data from various experiments with a focus on 2.5D flows and clean wings. A comprehensive validation was performed including 2.5 and 3D wings. Figure 1 shows a validation result on the TU Braunschweig sickle wing. The result of the original local correlation-based transition model as well as the same model with helicity-based extension is visible as contours of the skin friction coefficient and compared to the transition positions measured during a wind tunnel test.
 

Publications

  • Helm, Sebastian und Francois, Daniela Gisele und Grabe, Cornelia und Parekh, Jigar und Bekemeyer, Philipp (2023) CFD-basierte Transitionsvorhersage für den Entwurf von Laminarflugzeugen. In: Dt. Luft- und Raumfahrt Kongress DLRK 2023. Dt. Luft- und Raumfahrt Kongress DLRK 2023, 19.-21. Sep. 2023, Stuttgart, Deutschland
  • Parekh, Jigar und Bekemeyer, Philipp und Helm, Sebastian und Francois, Daniela Gisele und Grabe, Cornelia (2023) LAMINAR AIRFOIL DESIGN UNDER UNCERTAINTIES USING THE DLR GAMMA TRANSITION MODEL. Deutscher Luft- und Raumfahrtkongress 2023, 19.-21. Sep. 2023, Stuttgart, Germany. doi: 10.25967/610225
  • Helm, Sebastian und Francois, Daniela Gisele und Krumbein, Andreas (2023) Validation of CFD-based transition transport models to predict laminar-turbulent transition of swept transport aircraft wings. In: 21. STAB-Workshop - Jahresbericht 2023, Seiten 142-143. 21. STAB - Workshop 2023, 07.-08. Nov. 2023, Göttingen, Deutschland
  • Helm, Sebastian und Grabe, Cornelia und Krumbein, Andreas und von Soldenhoff, Richard und Lüdeke, Heinrich und Thamm, Konstantin und Scholz, Peter (2024) Wind Tunnel Test with Boundary Layer Suction for the Validation of Transition Transport Models. AIAA Scitech Forum. January 8-12, 2024, Orlando, Florida
Dr. Cornelia Grabe (Principal Investigator)
German Aerospace Center (DLR), Göttingen
Cornelia.Grabe(at)dlr.de
Sebastian Helm
German Aerospace Center (DLR), Göttingen
Sebastian.Helm(at)dlr.de
Photo credits on this page

Open Positions
Research
About us
Diversity
Contact 

SE²A on LinkedIn

Linkedin Icon

Contact information

Cluster of Excellence SE²A –
Sustainable and Energy-Efficient Aviation
Technische Universität Braunschweig
Hermann-Blenk-Str. 42
38108 Braunschweig

se2a(at)tu-braunschweig.de
+49 531 391 66661

 

 

© Technische Universität Braunschweig
Legal Notice Privacy Accessibility

TU Braunschweig uses the software Matomo for anonymised web analysis. The data serve to optimise the web offer.
You can find more information in our data protection declaration.